Turbine blading



Aug. 11, 1925.

R. C. ALLEN TURBINE BLADING Filed Aug. 9. 1323 INVENTOR ATTORNEY WITNESS 972? Patented Aug. 11, 1925.

UNETE STATS PI E ROBERT C. ALLEN, O'F ESSINGTON, PENNSYLVANIA, A'SSIGNOR TO VJESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

TURBINE BLADING.

Application filed August 9, 1922.

T 0 all whom it may concern:

Be it known that I, Ronmrr C. ALLEN, a citizen of the United States, and a resident of Essington, in the county of Delaware and State of Pennsylvania, have invented a new and useful Improvement in Turbine Blading, of which the following is a specification.

My invention relates to turbine blading, more particularly to blading of the wide exhaust type, and it has for its object to provide apparatus of the character designated which shall have simple, reliable, and inexpensive lashing means for effectively limiting blade vibration.

This and other objects, which will be made apparent throughout the further description of my invention, are attained by means of the apparatus herein described and illustrated in the drawings, accompanying and forming a part of this application, in which: F ig. 1 is a fragmentary sectional view of a turbine having wide blades with my improved lashing applied thereto; and Fig. 2 is a detail perspective view of blading showing my improved lashing connected thereto.

In the patent of Christian Gilson, 1,469,901, Oct. 9, 1923, application Serial No. 554,988, filed April 18, 1922, and assigned to the Westinghouse Electric and Manufacturing Company, there is disclosed and claimed a turbine having wide exhaust blades adapted to receive steam axially and to discharge it peripherally, the wide exhaust blades being made in sections for the purpose of facilitating manufacture. It is the object of my invention to provide simple, inexpensive, and reliable lashing means for blading sections of this type.

Referring now to the drawings for a more detailed description of my invention, I show a last, low-pressure stage, at 10, comprising a row of guide blades 11, carried by the turbine cylinder or casing 12, and a row of wide blades 13, carried by the turbine rotor 14. The wide blades 13 are adapteol to receive steam flowing in an axial direction from the guide blades 11 and to discharge the same at the tips from the spoon-outline, energy-abstracting portions 15. The wide blades 13 are made in sections 16 to facili- Serial No. 580,752.

tate manufacture. My improvement comprises lashing means for holding correspond ing sections together in order to limit blade vibration.

My improved lashing comprises a strip or strips mortised laterally of a tip-discharging blade or of the sections of such a blade. In the drawings, I show each of the blade sections 16 provided with recesses 17 near the tips to receive the lashing members or strips 18. Projections or tenons 19 are preferably provided in each recess and the 1ashing strips have openings 20 to receive the tenons or projections.

lVith sectionalized blading, such as illustrated, the lashing members 18 are placed in position in the recesses 17 after the annuli of blade sections 16 are assembled in succession toward the end of the rotor.

While I have illustrated tenons in the blade recesses which fit openings in the lashing members, it is to be understoood that, in so far as my invention is concerned, any form of positive fitting connection between the blading and lashing may be employed.

From the foregoing, it will be apparent that I have provided lashing for turbine blading which is economical to construct and to apply and which, due to its positive attachment to the blading, effectively limits blade vibration.

lVhile I have shown my invention in but one form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various other changes and modifications, without departing from the spirit thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are imposed by the prior art or as are specifically set forth in the appended claims.

What I claim is:

1. In a turbine, the combination of a row of relatively wide blades adapted to receive motive fluid axially and discharge it peripherally, said blades having recesses in the sides and near the tips, and a lashing member for securing the blades against vibration fitting into the recesses.

2. In a turbine, the combination of a row of laterally receiving tip-discharging blades having lateral recesses with projections in the recesses and a lashing member having recesses to fit the projections.

3. In a turbine, the combination of a row i of laterally receiving tip-discharging blades,

each of which comprises a plurality of sections having laterally disposed recesses with tenons therein and a plurality of lashing members having recesses to fit the tenons.

In testimony whereof, I have hereunto 10 subscribed my name this 8th day of August 1922.

ROBERT C. ALLEN 

